TV Little Mermaid's Island - Season 1 Episode 1 : Sebastian's Birthday Little Mermaid's Island - Season 1 Episode 1 : Sebastian's Birthday 6.2/10 by 6 users Ariel and her friends are planning a surprise birthday party for Sebastian. Details Casts Posters Images Title Little Mermaid's Island - Season 1 Episode 1 : Sebastian's Birthday Alternative Titles First Air Date 1990-12-31 Last Air Date 1990-12-31 Number of Episodes 2 Number of Seasons 1 Genres , Networks , Casts Michael Thompson, Jim Cummings, Samuel E. Wright, Veronica Taylor, Marietta DePrima, Buddy Hackett, Clive Revill Plot Keywords , Scales Michael Thompson Scales (voice) Jim Cummings Sebastian (voice) Samuel E. Wright Flounder (voice) Veronica Taylor Ariel Marietta DePrima Scuttle (voice) Buddy Hackett Grimsby Clive Revill Episodes List Little Mermaid's Island Season 1 :Episode 1 Sebastian's Birthday Sebastian's Birthday 1990-12-31 A spin-off of Disney's animated film The Little Mermaid. Two episodes were shot, but never aired. Little Mermaid's Island Season 1 :Episode 2 Tell The Truth Tell The Truth 1970-01-01 A spin-off of Disney's animated film The Little Mermaid. Two episodes were shot, but never aired.