It's not episode 78, is 79
79? that only leaves episode #80!!! AND #80 WILL BE THE LAST SEASON 4 EPISODE!!!!!!!!!!!!!!
61. Fear of a Krabby Patty / Shell of a Man
62. The Lost Mattress / Krabs Vs. Plankton
63. Have You Seen This Snail? (2-Part Episode)
64. Skill Crane / Good Neighbors
65. Selling Out / Funny Pants
66. Dunces and Dragons (2-Part Episode)
67. MermaidMan and BarnacleBoy VI / Enemy in Law
68. Patrick SmartPants / SquidBob TentaclePants
69. Krusty Towers / Mrs. Puff, You're Fired!
70. Ghost Host / Wishing You Well
71. Chimps Ahoy / Whale of a Birthday
72. Karate Island / All That Glitters
73. New Leaf / Once Bitten
74. Squidtastic Voyage / That's No Lady
75. Bummer Vacation / Wigstruck
76. Best Day Ever / The Gift of Gum
77. Driven to Tears / Rule of Dumb
78. The Pink Purloiner / Squidwood
79. Born to be Wild / Best Frenemies
80. Uncle Sherm's Visit / DJ Patrick
Or
61. Fear of a Krabby Patty / Shell of a Man
62. The Lost Mattress / Krabs Vs. Plankton
63. Skill Crane / Good Neighbors
64. Selling Out / Funny Pants
65. MermaidMan and BarnacleBoy VI / Enemy in Law
66. Patrick SmartPants / SquidBob TentaclePants
67. Have You Seen This Snail? (Where's Gary?)
68. Dunces and Dragons (Lost in Time)
69. Krusty Towers / Mrs. Puff, You're Fired!
70. Chimps Ahoy / Ghost Host
71. Whale of a Birthday / Karate Island
72. All That Glitters / Wishing You Well
73. New Leaf / Once Bitten
74. Squidtastic Voyage / Bummer Vacation
75. Best Day Ever / Wigstruck
76. That's No Lady / Driven to Tears
77. Rule of Dumb / Born to Be Wild
78. Best Frenemies / Gift of Gum
79. DJ Patrick / Uncle Sherm's Visit
80. The Pink Purloiner / Squidwood
Season 4 is done.