In which year, did this earliest guest star in 1999 for SpongeBob SquarePants stop providing the voice?
Mermaid Man and Barnacle Boy Mermaid Man and Barnacle Boy are fictional superheroes in the Nickelodeon animated television series "SpongeBob SquarePants". Mermaid Man was voiced by Ernest Borgnine from 1999 to his death in 2012, and Barnacle Boy is voiced by Tim Conway. Mermaid Man and Barnacle Boy were created and designed by Stephen Hillenburg. The characters debuted on August 21, 1999 in the series' episode "Mermaid Man and Barnacle Boy".
Long John Baldry John William "Long John" Baldry (12 January 1941 – 21 July 2005) was an English blues singer and a voice actor. He sang with many British musicians, with Rod Stewart and Elton John appearing in bands led by Baldry in the 1960s. He enjoyed pop success in the UK where "Let the Heartaches Begin" reached No. 1 in 1967 and in Australia where his duet with Kathi McDonald "You've Lost That Lovin' Feelin'" reached number two in 1980. Baldry lived in Canada from the late 1970s until his death; there he continued to make records and do voiceover work. Two of his best known roles in voice acting were as Dr. Robotnik in "Adventures of Sonic the Hedgehog", and as KOMPLEX in "Bucky O'Hare and the Toad Wars.