The Adventures of Rex the Wonder Dog #23

In "The Peril in the Jungle!" from The Adventures of Rex the Wonder Dog #23, Major Dennis, Danny, and Rex push deep into the African mountains on a quest for ancient cave paintings—only to find themselves hunted by prehistoric creatures with no clear motive. As giant boars, monstrous vultures, and deadly fish rise from the wild, Rex must protect his companions through treacherous terrain, until a sudden river plunge leads them into a hidden cave. There, they discover a startling truth: the very animals now attacking them once revered Rex as a savior, and centuries later, their loyalty has twisted into a relentless, ancestral grudge.

In "The Secret of the Spanish Castle!" from The Adventures of Rex the Wonder Dog #23 (1955), a mis-delivered letter sends the Sheriff on a wild chase to a relocated Spanish castle, where Bobo the dog uncovers a nest of robbers. With quick thinking and a daring escape through a suit of armor and a spinning weather vane, Bobo outwits the thieves and helps free the castle’s owner. The adventure ends with Bobo discovering a new passion — stamp collecting — after receiving a special album.

In "The Canine That Captured a Fort," Rex the Wonder Dog and his young friend Danny investigate the historic Fort Williams near the Canadian border—only to uncover a mystery when Danny notices the reenactors' uniforms are off. When Rex catches a whiff of something sinister and is locked in a dungeon, he uses his wits and courage to escape through a chimney, outmaneuvering crooks who’ve taken over the fort with an old cannon and a ransom demand.