Sigmund and the Sea Monsters (1973)

S1E5 Happy Birthdaze

Burp and Slurp hatch a plan to surprise Big Daddy for his birthday by sneaking Sigmund back home as a gift. In addition to Sigmund, they also swipe the cake and presents Aunt Zelda had prepared for the sheriff’s celebration. Now, it falls on Johnny and Scott to rescue the festive occasion before it’s too late and restore the joy of the Birthdaze.