TV Guide Heroes & Icons Network Sunday

An old mentor of Gallagher's, Colonel Gus "Pappy" Wexler, is flying as an observer on a mission and on the way back he's flying co-pilot when they're attacked.

The team works to recover a chip containing information about a possible terrorist attack; Kim is sent to bed rest due to pregnancy complications.

A pop princess is smuggled into an area by the team to help entertain a crowd of troops, while Bob and an escort return a prisoner to his homeland.

Grey requires emergency battlefield surgery, and the members of the Unit face a life-or-death situation when they become responsible for saving him.

Reno may finally have his hands on the evidence he will need to finally bring Dutch down and expose him, which is a videotape that shows Dutch killing his wife.

Reno tries to get a counterculture figure to surrender, as there is a bounty out for him for blowing up a chemistry building that killed a scholar decades ago.

The Eco Company team go exploring with Marine Science Institute employees as they journey across the Califonia Coast during the low tide.

The host performs experiments to demonstrate specific scientific principles related to selected scientific fields, including biology, chemistry and physics.

Dedicated individuals who work at the San Diego Zoo share glimpses into the world of wild animals providing a unique and up-close look at each animal.

The hosts explore a wide range of topics, from history and critical inventions to natural wonders and science in a quest to find all the answers.

An expedition throughout the animal kingdom with the goal of investigating traits and characters that are unique to different animals.

All of Gotham City's flower children are in trouble when Louie the Lilac comes to town and is looking to gain control over the hippies who inhabit the city.

The Joker plans on catching some waves, as he enters a surfing competition in hopes of winning the championship for himself by cheating his way to the top.

Wonder Woman battles cattle rustlers in Texas.

A government test pilot recovering from near-fatal injuries is thrust into the prying hands of enemy agents determined to pry top-secret information from him.

Clark is shocked when a frantic woman bursts into his office demanding to speak to Superman, and he learns that her nephew has caught him on camera.

A former Metropolis crime boss employs a European scientist to synthesize the only known substance in the universe that can harm Superman.

After narrowly preventing a nuclear explosion, Superman becomes a deadly source of radiation for those around him, and he is forced to live in a remote cabin.

An ex-marine who left Walker for dead in Vietnam steals a military helicopter with stealth capabilities to be used by a drug cartel.

Ranger Walker searches Dallas nightclubs to find out who raped a friend's daughter with the help of a drug that was slipped in her drink.

Three opportunists tail Alex, Walker and two forest rangers to the remote site of a plane that crashed eight years earlier with three million dollars on board.

Rangers Walker and Trivette attempt to find a bus full of innocent people that has been buried underground, all while a tornado approaches.

Ranger Walker uses a homeless man's pet canine to track him down in order to learn about his witnessing of a priest's untimely murder.

Captain James suffers a gunshot as he sets up protective detail on Trey, leaving him in critical condition, so Walker must take on the role of interim captain.

Dan panics and asks Liam for assistance when he finds out Serano is out on bail; Geri hosts an open mic night and persuades August to go up on stage.

While investigating the deaths of several miners, Kirk and Spock discover that the culprit is a territorial creature that burrows through rock.

The Enterprise crew attempts to communicate with the mysterious Crystalline Entity, which has killed millions throughout the galaxy.

Sisko is injured and stranded with Dukat on a deserted planet, where the Starfleet captain quickly realizes that his nemesis is more unhinged than ever.

Seska raids Voyager and steals a transporter module, prompting Chakotay to steal a shuttle and go after them, putting his life in danger.

The Enterprise crew finds that the crew of a freighter they have been sent to help is bent on seeking revenge against their attackers.

A delusional Immortal, who has been led to believe that he is on a holy mission from God, pursues Duncan under the mistaken impression that he is Satan.

An Immortal impersonates Methos in an attempt to spread a message of peace and urge his fellow Immortals to end The Game by laying down their swords.

An Immortal, who failed in her attempts to assassinate Adolf Hitler during WWII, devotes herself to killing corrupt politicians before the rise to power.

Sandy is determined to get the last word when her friend is murdered by serial killer who preys on women he meets through personal ads.

When a movie star disappears while a movie, the films producer hires Reno and Bobby to look for the missing actress; only one clue is left behind.